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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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S
Devin
A
Manus
S
Suno
S
TaglineRun any open-source AI model with an API call.Cognition Labs' autonomous coding engineer.Autonomous AI agent that actually finishes tasks.Prompt to full song with vocals, instruments, the works.
CategoryDev PlatformAgentsAgentsAudio
PricingPay per second of compute$500/moFree tier + $39-$199/moFree + $10/mo + $30/mo
Best forDevelopers using open-source models (Flux, SDXL, Whisper, etc).Engineering teams offloading tickets. Ops/platform work.People who want to hand off tasks entirely — trip planning, research, spreadsheet building.Jingles, intros, demos, sketches, personal use.
Strengths
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Works like an engineer — takes Slack tasks, opens PRs
  • Handles multi-hour engineering work
  • Reports back with what it did
  • General-purpose agent — research, book, build, analyze
  • Parallel task execution
  • Web browsing + file creation + coding
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
Weaknesses
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Expensive
  • Best for well-scoped tasks
  • Not for solo hobbyists
  • Still hit-or-miss on complex multi-hour tasks
  • Can burn credits fast
  • Copyright gray zone
  • Audio quality behind studio
Kai's verdictS-tier for open-source model APIs. The default in this space.A-tier for the right use case. Not for solo devs. If you manage engineers, try one license.S-tier in the agent category. The first one I'd give to a non-technical friend.S-tier in its category. The first AI music tool I'd actually listen to.
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